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//========================================================================
// Custom heap allocator test
// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#define GLAD_GL_IMPLEMENTATION
#include <glad/gl.h>
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#define CALL(x) (function_name = #x, x)
static const char* function_name = NULL;
struct allocator_stats
{
size_t total;
size_t current;
size_t maximum;
};
static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static void* allocate(size_t size, void* user)
{
struct allocator_stats* stats = user;
assert(size > 0);
stats->total += size;
stats->current += size;
if (stats->current > stats->maximum)
stats->maximum = stats->current;
printf("%s: allocate %zu bytes (current %zu maximum %zu total %zu)\n",
function_name, size, stats->current, stats->maximum, stats->total);
size_t* real_block = malloc(size + sizeof(size_t));
assert(real_block != NULL);
*real_block = size;
return real_block + 1;
}
static void deallocate(void* block, void* user)
{
struct allocator_stats* stats = user;
assert(block != NULL);
size_t* real_block = (size_t*) block - 1;
stats->current -= *real_block;
printf("%s: deallocate %zu bytes (current %zu maximum %zu total %zu)\n",
function_name, *real_block, stats->current, stats->maximum, stats->total);
free(real_block);
}
static void* reallocate(void* block, size_t size, void* user)
{
struct allocator_stats* stats = user;
assert(block != NULL);
assert(size > 0);
size_t* real_block = (size_t*) block - 1;
stats->total += size;
stats->current += size - *real_block;
if (stats->current > stats->maximum)
stats->maximum = stats->current;
printf("%s: reallocate %zu bytes to %zu bytes (current %zu maximum %zu total %zu)\n",
function_name, *real_block, size, stats->current, stats->maximum, stats->total);
real_block = realloc(real_block, size + sizeof(size_t));
assert(real_block != NULL);
*real_block = size;
return real_block + 1;
}
int main(void)
{
struct allocator_stats stats = {0};
const GLFWallocator allocator =
{
.allocate = allocate,
.deallocate = deallocate,
.reallocate = reallocate,
.user = &stats
};
glfwSetErrorCallback(error_callback);
glfwInitAllocator(&allocator);
if (!CALL(glfwInit)())
exit(EXIT_FAILURE);
GLFWwindow* window = CALL(glfwCreateWindow)(400, 400, "Custom allocator test", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
CALL(glfwMakeContextCurrent)(window);
gladLoadGL(glfwGetProcAddress);
CALL(glfwSwapInterval)(1);
while (!CALL(glfwWindowShouldClose)(window))
{
glClear(GL_COLOR_BUFFER_BIT);
CALL(glfwSwapBuffers)(window);
CALL(glfwWaitEvents)();
}
CALL(glfwTerminate)();
exit(EXIT_SUCCESS);
}
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